| 摘要 |
As formed from a predetermined length of carbon steel wire, such as AISI C 1062 steel wire or high-manganese carbon steel wire, in sequential forming , rolling, and austempering steps, a pin for axial, non-rotational penetration into a steel, concrete, or masonry substrate has a head, a tapered shank, a point h aving a tip, and a transition zone between the tapered shank and the head. The hea d has an outer diameter at least about 2.6 times greater than the initial diameter of the wire predetermined length. The smaller end of the tapered shank has a diamet er about 0.6 times the initial diameter thereof. The larger end of the tapered shank has a diameter about 0.7 times the initial diameter thereof. The point is jo inedunitarily to the smaller end of the tapered shank an d conforms except at the tip, which is rounded, substantially to a tangent ogive, which is tangent to the tapered shank. The transition zone has a tapered portion with a smaller end joined unitarily to the larger end of the tapered shank and a with larger end joine d unitarily to the head at a circumferential fillet. The larger end of the tap eredportion of the transition zone has a diameter about 1.1 times greater than the initial diameter of the wire predetermined length. The axial length of the transitio n zone is less than about one half ofthe axial length of the tapered shank. The austempering step provides the pin with a surface hardness not greater than about Rockwell C 48 and with a core hardness in a range from about Rockwell C 48 t o about Rockwell C 58. |
